"""add enabled column to 'TB_PRODUCT'Revision ID: 335ff300f22bRevises: 1e9ee2636f8aCreate Date: 2013-04-25 16:09:30.092000"""# revision identifiers, used by Alembic.revision = '335ff300f22b'down_revision = '1e9ee2636f8a'from alembic import opimport sqlalchemy as sadef upgrade():    op.add_column("TB_PRODUCT", sa.Column("enabled", sa.Boolean, default=True))    op.execute("UPDATE TB_PRODUCT SET ENABLED=1")def downgrade():    op.drop_column("TB_PRODUCT", "enabled")